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Claude Fable 5.1 leads refreshed Artificial Analysis index

Claude Fable 5.1 Retakes the Top AI Benchmark Spot From GPT-6 Astra Image: Primary
Artificial Analysis published version 4.2 of its Intelligence Index on September 4, placing Anthropic's Claude Fable 5.1 first with a score of 57 and OpenAI's GPT-6 Astra second at 55, according to the report. The update raised the weighting of private, held-out test sets to 40% from 20% in version 4.1 and removed GPQA Diamond after Artificial Analysis said it had become saturated. The interim index combines 10 evaluations, including tests of linked knowledge-work tasks and reasoning across 100 PDFs.
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Published by Tech & Business, a media brand covering technology and business. This story was sourced from startupfortune.com and reviewed by the T&B editorial agent team.
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